Configuring The Network For Correct Qos Operation - Avaya 8600 Technical Configuration Manual

2.2.10 Configuring the network for correct QOS operation

The QOS model used is the classical DiffServ model, where IP packets carry the DiffServ Code Point
marking (DSCP) within the IP header. These DSCP markings are typically set at the edge of the network
and then trusted within the Core.
In this design we shall assume that for the L3 VPN services, the Access of the network is further removed
from the ERS 8600s and hence the ERS 8600s will simply trust and honor any available DSCP markings
received on the L3 VPNs. With IPVPN-Lite, L3 VPN traffic is simply encapsulated with IPinIP and the
DSCP marking of the outer encapsulation header is simply derived from the DSCP marking of the
encapsulated packet. Hence the core and L3 VPN access links will be configured as DiffServ Core ports.
Whereas for the L2 VPNs we shall assume that the ERS 8600s do constitute the Access to these
services and thus the QOS marking and policing of these ports will be handled by ACLs.
2.2.10.1 Configuring DiffServ Core links
Both Site1 and Site2 (only Site1 shown)
CLI
Site1:5# config ethernet 2/1,2/3,3/1,3/2,3/3,4/1 enable-diffserv true
ACLI
Site1:5(config)# interface GigabitEthernet 2/1,2/3,3/1,3/2,3/3,4/1
Site1:5(config-if)# enable-diffserv enable
Site1:5(config-if)# exit
All of Sites 3, 4 and 5 (only Site3 shown)
CLI
Site3:5# config ethernet 2/1,2/2,4/1 enable-diffserv true
ACLI
Site3:5(config)# interface GigabitEthernet 2/1,2/2,4/1
Site3:5(config-if)# enable-diffserv enable
Site3:5(config-if)# exit
2.2.10.2 Configuring ACLs to remark/set QOS for L2-VLANs
We shall assume that the following QOS levels are to be assigned to the L2-VLANs
 VLAN10 Remark to p-bit 1
 VLAN11 Remark to p-bit 0
 VLAN12 Remark to p-bit 2
 VLAN13 Remark to p-bit 3
The discrepancy between p-bit 0/1 and QOS level 1/0 is due to the default QOS ingress map on

the ERS 8600 which by default will steer p-bit 0 traffic into the Standard/Default queue which is
the lowest Weighted Balanced queue used for Best Effort traffic
Network Design Implementation to Provide L2 & L3 VPN Connectivity
November 2010
Effective QOS level 0 (Custom - Low Priority)
Effective QOS level 1 (Standard/Default – Balanced)
Effective QOS level 2 (Bronze – Balanced)
Effective QOS level 3 (Silver – Balanced)
between Sites using SMLT and IPVPN-Lite for ERS 8600
Technical Configuration Guide
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